repeat in lyric歌词中的重复

I'm a big big girl,in a big big world, it's not a big big thing if you leave me,but i do do feel that i too too will miss you much. miss you much. I can see the first leaf falling,it's all yellow and nice,it's so very cold outside,like the way i'm feeling inside. I'm a big big girl, ...... miss you much... Outside it's now raining,and tears are falling from my eyes,why did it have to happen,why did it all have to end ? I'm a big big girl,...... miss you much...... I have your arms around me ooooh like fire,but when i open my eyes,you're gone...

(==if i give u a golden ring==如果我给你一个金戒指)

If i give u a golden ring, will u marry marry me, will u marry marry marry me ? If u give me a golden ring, i will never marry u, i will never never marry u .

above is lyric of 2 songs. in first time, when i touch these 2 or 3 times repeating words, i feel very curious, why do they say "i will never never never marry u " ? why it's not " i will never marry u". later, after more and more reading and singing, i know, they just want to emphasize this feeling.